Ensure v8 is initialized before initializing debug context

Review URL: http://codereview.chromium.org/1756018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4534 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -4020,6 +4020,7 @@ void Debug::ProcessDebugMessages() {
 }
 
 Local<Context> Debug::GetDebugContext() {
+  EnsureInitialized("v8::Debug::GetDebugContext()");
   ENTER_V8;
   return Utils::ToLocal(i::Debugger::GetDebugContext());
 }

test/cctest/test-debug.cc

@@ -6147,3 +6147,12 @@ TEST(CallingContextIsNotDebugContext) {
 }
 
 
+TEST(DebugContextIsPreservedBetweenAccesses) {
+  v8::HandleScope scope;
+  v8::Local<v8::Context> context1 = v8::Debug::GetDebugContext();
+  v8::Local<v8::Context> context2 = v8::Debug::GetDebugContext();
+  CHECK_EQ(*context1, *context2);
+  // Make sure debugger is unloaded before running other tests.
+  v8::internal::ForceUnloadDebugger();
+  CheckDebuggerUnloaded();
+}